GN: Remove webrtc_base target in favor for rtc_base.

The last reference to the old target name was
removed in https://crrev.com/7c9149860a8a0ca24350d2e80dbc280990a0cbb7

R=perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/33079004

Cr-Commit-Position: refs/heads/master@{#8179}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8179 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index 54fcdca..670e42c 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -129,14 +129,6 @@
   ]
 }
 
-# Temporary target until Chromium's use of webrtc_base is updated to rtc_base.
-# TODO(kjellander): Remove when this is rolled into Chromium's DEPS.
-group("webrtc_base") {
-  deps = [
-    ":rtc_base",
-  ]
-}
-
 static_library("rtc_base") {
   cflags = []
   cflags_cc = []